ALLNIC AUDIO L-10000 Owner's Manual - Page 4

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INTRODUCING THE L-10000 OTL/OCL LINE-STAGE PREAMPLIFIER

Immerse yourself in the original recorded space. The L-10000 OTL/OCL (Output Transformer-

Less/Output Capacitor-Less) is a triple gain stage, remote controlled, line-stage preamplifier,

without transformers or capacitors in its single-ended signal path. It uses the 300B direct-

heated, single-ended triode as its directly coupled output power tubes; i.e., there are no

output transformers on the single-ended (unbalanced) outputs, so the 300Bs communicate

the signal directly to the connected power amplifier or amplifiers. The 300B has justly won the

reputation of being a superb output tube in single-ended amplifiers, and in the L-10000

OTL/OCL preamplifier they fully reveal their inherent accuracy and beauty.

In common circuits, output capacitors or output transformers are required to separate the AC

music signal from the DC operating potential. If this is not done, the latter will destroy the

power amplifier, the loudspeakers, or both. However, these two coupling devices also

introduce their own influences on the transmission of the musical signal, adding their own

character (colouration), increasing distortion, and consuming small signals, all as predicted by

physical efficiency theory. In addition, they also limit signal dynamics. For these reasons, the

elimination of output transformers and capacitors has been considered the best solution for

the design of the most accurate amplifiers. Removal of these two coupling devices from the

signal path achieves the best results possible:

No colouration of the musical signal

•

Extremely detailed expression, natural harmonics and subtle musical decay

•

The lowest possible distortion

•

The widest musical dynamics

•

In the L-10000, there is no coupling device between the preamplifier and the power amplifier;

that is, the final gain/output tubes are directly connected to the power amplifier. Thus, the

benefits listed above are fully present in the Allnic L-10000 preamplifier.

Some circuit experts might be concerned about DC potential in the music signal in an OTL/OCL

design. However, the chance of this problem occurring can be 100% reliably eliminated by

doing away with the potential for DC in the signal path. To do this, Allnic uses a "floating power

supply circuit", a design which deals with the theoretical issue by simply not creating any DC

potential in the first place.

The L-10000's OTL/OCL circuit is basically SEPP, "Single-Ended, Push-Pull", so a "cancellation

circuit" is required to adjust the balance of signal between the upper and lower power output

tubes' input grids. Allnic uses an extremely sophisticated "Active Balanced Positive and

Negative Feedback Circuit", in which the 6AN8 pentode perfectly controls the circuit's

operation with extremely low distortion and incredible speed.

The L-10000 OTL/OCL is a world-class, reference level, line-stage preamplifier. It offers

unbelievably realistic, holographic sound-staging combined with incredible resolution, clarity,

micro-dynamics, and drive. Instrument and vocal tones and timbres are breathtakingly lifelike,